Statement Of Financial Position [Abstract]
| Concept |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2020-09-30 |
As at 2020-09-30 |
As at 2020-09-30 |
As at 2020-09-30 |
As at 2020-09-30 |
As at 2020-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||
| Property, plant and equipment |
15 2
GBP
|
— | — | — | — | — |
164,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Goodwill |
2,416,000,000
GBP
|
— | — | — | — | — |
1,87 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables |
128,000,000
GBP
|
— | — | — | — | — |
113,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
19,000,000
GBP
|
— | — | — | — | — |
40,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current assets |
3,013,000,000
GBP
|
— | — | — | — | — |
2,405,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||
| Trade and other current receivables |
355,000,000
GBP
|
— | — | — | — | — |
295,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
489,000,000
GBP
|
— | — | — | — | — |
567,000,000
GBP
|
— | — | — | — | — | — | — | — |
848,000,000
GBP
|
— | — |
| Current assets other than non-current assets or disposal groups classified as held for sale or as held for distribution to owners |
–
GBP
|
— | — | — | — | — |
39,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets |
883,000,000
GBP
|
— | — | — | — | — |
924,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Assets |
3,896,000,000
GBP
|
— | — | — | — | — |
3,329,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital |
12,000,000
GBP
|
— | — | — | — | — |
12,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
570,000,000
GBP
|
— | — | — | — | — |
448,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Share premium |
548,000,000
GBP
|
— | — | — | — | — |
548,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity |
1,397,000,000
GBP
|
12,000,000
GBP
|
206,000,000
GBP
|
570,000,000
GBP
|
61,000,000
GBP
|
548,000,000
GBP
|
1,111,000,000
GBP
|
42,000,000
GBP
|
448,000,000
GBP
|
61,000,000
GBP
|
12,000,000
GBP
|
548,000,000
GBP
|
123,000,000
GBP
|
908,000,000
GBP
|
61,000,000
GBP
|
1,652,000,000
GBP
|
12,000,000
GBP
|
548,000,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||
| Non-current provisions |
20,000,000
GBP
|
— | — | — | — | — |
49,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current payables |
6,000,000
GBP
|
— | — | — | — | — |
3,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
16,000,000
GBP
|
— | — | — | — | — |
5,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities |
1,173,000,000
GBP
|
— | — | — | — | — |
838,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||
| Current provisions |
33,000,000
GBP
|
— | — | — | — | — |
68,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables |
368,000,000
GBP
|
— | — | — | — | — |
592,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Liabilities included in disposal groups classified as held for sale |
–
GBP
|
— | — | — | — | — |
13,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities |
1,326,000,000
GBP
|
— | — | — | — | — |
1,3 80
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
2,499,000,000
GBP
|
— | — | — | — | — |
2,218,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |